With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
tn3270sTimingMarkSupported
tn3270s Timing Mark Supported
1.3.6.1.4.1.9.9.54.1.1.1.1.11
This variable indicates whether to send a timing mark to solicit a response before sending a response to the host. true indicates that a timing mark is sent, false indicates that it is not sent. By using timing mark, an application can determine the response time from the client. Some existing clients do not implement the timing mark correctly and will not work with this server if this parameter is set to true
Back to CISCO-TN3270SERVER-MIB MIB page.
IPHost Network monitor allows you to monitor tn3270sTimingMarkSupported on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.